CNN

Compiled by Jonathan Helman, CNN Washington Bureau

Tonight, Hillary Clinton and Barack Obama face off at The Cleveland State University in Cleveland, Ohio at an NBC sponsored debate from 9 to 10:30p.m. ET.

*Hillary Clinton hosts a town hall meeting in Lorain, Ohio before participating in the NBC Democratic Debate.

*Mike Huckabee is in Ohio. He holds a media availability in Cleveland, attends a rally and hosts a media availability in Columbus, and attends a rally in Mason.

*John McCain attends a rally and holds a media availability in Cinncinnatti, Ohio. Later, he attends a town hall meeting in West Chester, Ohio.

*Barack Obama holds a media availability in Cleveland, Ohio before participating in the NBC Democratic Debate.